<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .a1{
            width: 320px;
            height: 190px;
            position: absolute;
            top: 50%;
            left: 50%;
            margin-top:-100px;
            margin-left:-100px;
        }
        .a2{
            position: absolute;
            top: 50%;
            left: 50%;
            margin-top:36px;
            margin-left:152px;
        }
        .a3{
            position: absolute;
            top: 50%;
            left: 50%;
            margin-top: 36px;
            margin-left:-100px;
        }

    </style>
</head>
<body>
    <div class="a1">
        <img src="img/adv.jpg">
    </div>
    <div class="a2">
        <img src="img/br.gif">
    </div>
    <div class="a1">
        <img src="img/top_tu.gif">
    </div>
    <div class="a3">
        <img src="img/bl.gif">
    </div>
</body>
</html>